90457 01A_Diablo_620_Serial_Interface_Apr82 01A Diablo 620 Serial Interface Apr82

User Manual: 90457-01A_Diablo_620_Serial_Interface_Apr82

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MODEL 620 PRINTER/TERMINAL
SERIAL INTERFACE
90457-01 REV A April, 1982
DIABLO SYSTEMS INCORPORATED
A XEROX
Company
FCC NOTICE
Warning: This equipment
generates,
uses and can
radiate
radio frequency energy and, if
not installed in accordance with
the
instructions manual, may cause
interference
to
radio
communications.
This equipment has been
type
tested
and found
to
comply with
the
limits for a Class B
computing device in accordance with
the
specifications in Subpart J
of
Part
15 of
the
FCC
Rules, which
are
designed
to
provide reasonable
protection
against such
interference
in a residential installation. This equipment
generates
and uses radio
frequency energy, and if not installed and used properly in
strict
accordance
with
the
manufacturer's
instructions, may cause
interference
to
radio and television reception.
There is, however
no
guarantee
that
interference
will not
occur
in a
particular
installation.
If
equipment
certified
to
meet
the
Class B limits does cause
interference
to
radio or
television reception, which
can
be determined by turning
the
equipment
off
and on,
the
user is encouraged to
try
to
correct
the
interference
by one or more
of
the
following
measures: (a) Reorient
the
receiving antenna.
(b)
Relocate
the
equipment with
respect
to
the
receiver.
(c)
Move
the
equipment away from
the
receiver.
(d)
Plug
the
equipment into a
different
outlet
so
that
the
equipment and
the
receiver
are
on
different
branch circuits.
If neccessary,
the
user should consult
the
dealer
or an experienced radio/television
technician for additional suggestions. In addition, an
FCC
booklet, "How
to
Identify and
Resolve Radio-TV
Interference
Problems", Stock
No.
004-000-00345-4, is available from
the
U.S.
Government Printing Office, Washington, D.C., 20402.
In equipment labeled Class B Compliant a shielded and grounded I/O cable is necessary
to
achieve compliance with
the
FCC Rules regarding radio emissions from computers. Please
consult your authorized Diablo sales
representative
for
further
details regarding
the
cable.
©Copyright 1982 Diablo Systems Incorporated
(A
XEROX Company). All rights reserved.
Diablo®,
XEROX®
and
HyType.!'
are
trademarks
of
XEROX CORPORATION.
HyFeed and HyPlot
are
trademarks
of
Diablo Systems Incorporated.
i
REV
A (4/82)
/
PREFACE
The
contents
of
this manual
represent
the
unit as
manufactured
at
the
time
of publication.
Diablo Systems Inc.
reserves
the
right
to
make changes and/or improvements
to
its
prod-
ucts
without incurring any obligation
to
incorporate
such changes or improvements in units
previously sold or shipped.
Diablo publishes descriptive Brochures and
Data
Sheets, Operators Guide,
Product
Description, Maintenance Manual and a
Parts
Catalog
for
each
product line. Changes
which
alter
manual
content
are
covered by publishing a Revision Addenda
to
the
affected
manuaL Diablo publications may be
requested
from your Diablo Sales
Representative,
or
may
be
ordered from Diablo using
the
form
at
the
back
of
this manuaL
Comments
on all
Diablo publications or
their
use
are
invited.
Please
address your comments to:
Manager,
Product
Support Publications
Diablo Systems Incorporated
P. O.Box 5003
Hayward, California, 94545
WARRANTY
Diablo Model 620
Printers
are
warranted
against
defects
in
materials
and workmanship for
90
days as outlined in
the
warranty
statement
included
as
a
separate
publication and
packed with
the
unit. Any questions regarding
the
warranty
not
covered by
this
statement
should
be
directed
to
your Diablo Sales
Representative.
UL/CSA/VDE
UL
recognized and
listed
under File
No.
E51242.
CSA
certified
as a component and
printer
under CSA File
No.
LR2196.
Complies with
VDE
regulations 0730 and 0871
Printed
in The
USA
REV
A (4/82)
ii
/
TABLE
OF
CONTENTS
SECTION 1
GENERAL
INFORMATION
1.1
General
Information
1-1
1-2
1.2
Signal
Conventions
.......
.
INTERFACE
HARDWARE
AND
SIGNALS SECTION 2
2.1
General
.
~
. . . • .
2-1
2-1
2-1
2-1
2-1
2-1
2-2
2.2
2.3
2.4
2.5
RS-232-C
Serial
Interface
Cable
•
Input/Output
Level
Converter
Circuits
2.3.1
Input
Level
Converter
...
2.3.2
Output
Level
Converter
Interface
Signal
Pin
Assignments
Interface
Signal
Definitions
....•••
OPERATING CONSIDERATIONS SECTION 3
3.1
Gener
al
. . . . . . . . . . . . . . . . . . .
..
3-1
3.2
3.3
3.4
3.5
3.6
3.7
3.B
3.9
3.10
3.11
3-12
3.13
3.14
3.15
Control
(CTRL)
Codes
. • . . •
.•
.••
3-1
Escape
Code
Sequences
. • . . •
•.
.•.
3-3
Communications
Protocols
• • . . . • . . . . • .
3-4
3.4.1
DCl/DC3
Protocol
(XON/XOFF)
•.•
. • • • .
3-4
3.4.2
ETX/ACK
Protocol
• . • . • . . • . • • • .
3-4
3.4.3
Printer
Ready
Protocol
. . . . • . . • • • . •
••
3-4
Operator
Control
Panel
• • • • • • • •
..
. • .
3-5
3.5.1
Slide
Switches
• • • •
••
...•
3-5
3.5.2
Command
Switches
•
••
.....•
3-6
3.5.3
The
Power
Indicator
• . • • • . . . . .
.•
3-6
Printing
Format.
. • . • • • • • • • • • • . . .
3-6
3.6.1
Definition
of
Terms.
. • •
••
.....••.
3-6
3.6.2
Standard
Printing
Formats
•••....•.
3-B
3.6.3
Proportional
Space
Printing..
.•...•••
3-B
3.6.4
Optional
Printing
Formats.
• . . • . . • • • • . •
3-B
3.6.4.1
Variable
HMI
• .
••
••••.
3-9
3.6.4.2
Variable
VMI
. . .
••
.•...•
3-9
3.6.4.3
Lines
Per
Page..
.•••••••
3-9
3.6.4.4
Hammer
Energy/Ribbon
Advance
.
.•
3-9
Forward/Backward
Printing
. . • .
..
•••.••••
3-9
3.7.1
Auto
Backward
Printing
••••
•
••
.••..
3-9
3.7.2
Programmed
Backward
Printing
• • • • •
3-10
Margin
Control
. • . . . • • • • • • • •
3-10
3.B.l
Horizontal
Margins
• • . • • • .
••
.
••••
3~10
3.B.2
Vertical
Margins
. • • . • . • .
•.
.
••••
3-10
Tabbing
. . . . . . . .
..
.............
3-11
3.9.1
Absolute
Horizontal
Tab
...•.•••••..••
3-11
3.9.2
Absolute
Vertical
Tab
....•••••••••
3-11
Line
Feed
• •
.•
.....•
• . . •
•.
..••
3-12
Half
Line
Feed
• • • . . • • . • • •
3-12
Form
Feed
• . • • • • • • .
•.
.•.••
..••
3-12
Graphics
• • .
•.
.••••••••
...•••
3-12
Reset/Initialization
. • • • . . •
••
.
•..•
3-12
Program
Mode • • • . . . • • . • • . •
•.
•
3-12
3.15.1
Spoke
Position
Data
••••••.....•••
3-13
3.15.2
Hammer
Energy/Ribbon
Advance
Data
• •
••
•
3-13
REV
A
(4/B2)
iii
3.16
Print
Wheel
Down-Load
Feature.
• . .
•.
•
•....
3-13
3.16.1
General
. • • • • • • • • •
••
.•.
•
3-13
3.16.2
Down-Load
Record
Format
.•••••••••••
3-15
3.16.2.1
Record
Start
Character
.••.••••
3-15
3.16.2.2
Record
Type
Character
.
••
• •
3-15
3.16.2.3
Byte
Count
• • • • • . . .
•.
..
3-16
3.16.2.4
Load
Address
• • • • •
3-17
3.16.2.5
Table
Data
• • • •
••
...
•
3-17
3.16.2.6
Checksum
• • •
••
.•
• .
3-18
3.16.3
Down-Load
Procedure
••••••••••..••
3-18
3.16.4
Sample
Down-Load
Structure
•••••••••••
3-19
3.17
Self
Test/Remote
Diagnostic
Feature.
•
•••••••
3-20
SECTION
4.1
4.2
4.3
4.4
Figure
1-1
1-2
2-1
3-1
3-2
3-3
3-4
3-5
3-6
3-7
4-1
4-1
Table
2-1
2-2
3-1
4-1
4-2
3.17.1
Self
Test
Feature
• . . . . . • • • • • • •
3-20
3.17.2
Remote
Diagnostic
Feature
•
••
•
•••••
3-21
3.17.2.1
ESC
SUB
I
Remote
Initialize
•..
3-21
3.17.2.2
ESC
SUB
R -
Remote
Error
Reset
..••
3-21
3.17.2.3
ESC
SUB
1 -
Status
1
Request
•••••
3-21
3.17.2.4
ESC
SUB
SO
-
RAM/ROM
Test
•....•.
3-21
3.17.2.5
ESC
SUB
ENQ
-
Enter
Test
Mode
.••..
3-22
4 OPERATING REFERENCES
General
Information
• • • • . . • • • • .
ASCII
Coding
System
• • • • • . . . . • .
Print
Wheel
Code
Chart
(Typical)
.••••.
Decimal
Value
Tables
• • • • . • . . • • • •
ILLUSTRATIONS
4-1
4-1
4-2
4-3
Model
620
Block
Diagram
••••••••
Model
620
S & C
Circuit
Board
••••
. . . . .
..
1-1
.
..
...
1-2
· . . .
..
2-1
· . . .
3-5
. . .
..
...
3-7
. . . . . . . . . .
3-14
EIA
RS-232-C
Interface
Cable
. • . . • •
Operator
Control
Panel
• • • • • • •
Page
Layout
and
Printing
Format.
Down-Load
Variations
.••...•.
Down-Load
Record
Format
• • . • • • •
Down-Load
Table
Memory Map . • . • • • .
Sample
Down-Load
Structure
. . •
• • • • • •
3-15
• • • • • •
3-16
. . . . . . . .
3-19
Sample
Self
Test
Printout
•••••.
Standard
ASCII
Code
Chart
• • • •
98-Character
Print
Wheel
-
Composite
•••
TABLES
• • . . . •
3-20
. .
..
4-1
4-2
EIA
Interface
Connector
Pin
Assignments
• • . . • . •
2-2
Cable
wiring
Between
I/O
and
Circuit
Board
Connectors
2-2
Standard
& PS
Printing
Formats
. . . . . • . • •
3-8
ASCII
Values
for
ESC
Sequences
-
Set
HMI
and
VMI
••••
4-3
ASCII
Values
for
ESC
Sequences
-
Set
Absolute
Tab
(H
&
V)
and
Lines/Page
• • •
••
4-4
iv
REV
A
(4/82)
REVISION
CONTROL
RECORD
MODEL
620
SERIAL INTERFACE -PUBLICATION NO.
90457-01
NOTE: On
revised
pages
of
text,
a
heavy
vertical
bar
in
the
margin
indicates
each
area
of
new
revision.
--
PAGELREV
Cover
A
i A
ii
A
iii
A
iv
A
v A
1-1
A
1-2
A
2-1
A
2-2
A
3-1
A
3-2
A
3-3
A
3-4
A
3-5
A
3-6
A
3-7
A
3-8
A
3-9
A
-PAGE/REV
3-10
A
3-11
A
3-12
A
3-13
A
3-14
A
3-15
A
3-16
A
3-17
A
3-18
A
3-19
A
3-20
A
3-21
A
3-22
A
4-1
A
4-2
A
4-3
A
4-4
A
PAGE/REV
90457-01
REV
A
(4/82)
v
SECTION 1
GENERAL DESCRIPTION
1.1
GENERAL INFORMATION
The Model 620
Printer/Terminal
has only one major printed
circuit
board (PCB). This PCB
is called Serial & Control, and
incorporates
all
interface,
logic,
systems
driver and power
regulator circuits.- Only
the
power supply
rectifier
and
control
panel
circuits
are
separate.
The Model 620 is capable of
operating
at
data
transfer
rates
of
110, 300 and 1200 baud.
It
communicates using
the
USA
Standard
Code for Information Interchange (ASCII),
it
conforms to
EIA
RS-232-C (CCITTV-24)
interface
standard, and
it
is compatible with
the
Bell 103A and
other
equivalent modems.
An
appropriate
interface
cable for
interconnecting
between
the
Model
620
and
the
modem is available from Diablo. See sUbsection
2.2.
Car.
Home
Sensor
Print Wheel
Sensor
UPI
ROM RAM
r--------,
~B
4it
I
jOPTION~
L
________
J •
CONTROL
PANEL
RS·232·C
CPU
~
Power
On
Reset
+9V+
32V
t
0----1
POWER
t--4~~
REGULATORS
SUPPL
Y
t----4I
........
Figure 1-1 MODEL 620 BLOCK DIAGRAM
Carriage
Platen
Ribbon
Print
Wheel
Print
Hammer
Figure 1-1 contains a block diagram depicting
the
Model 620. The
interface
section
receives
serial
ASCn
data
via
its
RS-232-C connector, and
directs
the
data
into
the
microprocessor logic chain. The microprocessor processes
the
data
into
control
signals
which
are
then
channeled
to
the
several
subsystem driver
circuits.
The drive
circuits
develop
the
power signals for
their
associated
printer
mechanisms
(carriage
motor,
print
wheel motor,
platen
or paper feed motor, and ribbon drive)
to
produce
the
printed
result.
The
control
panel
interfaces
directly
to
the
Serial & Control PCB.
It
supports
an
8-section
DIP switch which
permits
selection
of
operating
parameters
(Page Size, Auto Line
Feed,
Self
Test,
Printer
Ready/DCl/DC3,
Parity
On/Off-Odd/Even, and Baud Rate/Option), and
four
touch-action
switches which
are
used
to
command
Reset,
Pause, Line
Feed
and Form
Feed.
REV
A (4/82) 1-1
I~
I~
~
,c:::J
A24
,
CAR.
A
10
MOTOR
POWER
I::d~
,I
I
A33 ...
,-l,.-c;
A54
PLATEN
oot
I
'I'
CARRIAGE
UTILITY
MOTOR
« n
IPW
MOTORIIR'S.
DR.
MOTOR)
Y
IPW
SENSORIIHAMMER)
)~
CAR'r--l
CONTROL2CJ'O
Al13
~1
HOME
ic:==I
PANEL' O(GNOIO
L=.:l5
SENSOR'
A91
Al02
~l1L,
A121
~~
'-
___
,
I/O
, I ° I
Bl09
I~
B1031 .
,[]f[]
(EXP.
RAMIO
I~
I
Cll0
L-
__
-'
,LQITJ
,~,~
,)
0109
I~
,rnD
I~
ILQru
I~
ILBLJ
I~
,LlliJ
I~
I[ED
SIC
PCB COMPONENT SIDE
I
[EM:]
~
__
E_9_9
__
...J1~01101
I
Will
F99
Figure 1-2
MODEL
620
S & C CIRCUIT BOARD
Figure 1-2 shows
the
location of
the
major components and connectors on
the
S&C
PCB.
1.2
SIGNAL CONVENTIONS
All signal designations used in this manual comply with
the
following conventions.
1.
A signal name prefixed by a
"_"
symbol (as in
-Rx
DATA) identifies a signal
whose
active
state
is a low
electrical
level.
2.
A signal name prefixed by a "+" symbol (as in + DTR) identifies a signal whose
active
state
is a high
electrical
level.
3.
Electrical
levels
are
identified by "H"
(HI)
or "L" (LO).
HI
indicates
an
electrical
level
greater
than
2.4
volts.
LO
indicates
an
electrical
level
less
than
0.8
volts.
4.
The
"true"
state
of a signal is indicated by a logical "1", and
the
"false"
state
by a logical
"Oil,
regardless of
electrical
levels.
For
example,
-Rx
DATA = 1 =
LO; and +DTR = 1 =
HI.
1-2
REV
A (4/82)
SECTION 2
INTERFACE HARDWARE AND SIGNALS
2.1
GENERAL
The
information
in
this
section
pertains
to
the
signal
interface
only.
Information
regarding
power supplies, grounding
requirements,
ventilation
and physical
space
requirements
is
contained
in
Section
2
of
the
Model 620
Product
Description
manual,
Publication
No.
90452-XX.
2.2
RS-232-C SERIAL INTERFACE CABLE
An EIA RS-232-C
compatible
interface
cable,
PIN 152S2416X*, is
available
from
Diablo for
use
with
the
Model 620. This
cable
is
illustrated
in
Figure
2-1.
Cable
lengths
available
from
Diablo
are
(*) 10'
(X=O),
15' (X=l), 25' (X=2) and 50' (X=3).
The
cable
is
terminated
on
each
end with a
D-subminiature
Cannon
or
Cinch
DB-25P
connector,
and
is
shielded
for
VDE/FCC emission compliance.
10
014
015
016
20
30
40
017
50
018
019
60
70
020
021
80
022
90
023
100
110
024
025
120
PI
TO TERMINAL
Figure
2-1 EIA RS-232-C INTERF ACE CABLE
2.3
INPUT/OUTPUT LEVEL CONVERTER CIRCUITS
2.3.1 Input
Level
Converter
P2
TO MODEM
OR
COMPUTER
The Model 620's
circuit
board
uses
a
type
75154 line
receiver
to
convert
the
+/-12V
modem signals
into
+5V
and
OV
for use by
the
TTL logic. These
circuits
are
capable
of
handling
the
+/-3V
to
+/-25V maximum
voltage
swings allowed
under
EIA
Standard
RS-232-C. Input
resistance
is
from
3K
to
7K
ohms,
with
5K
typical.
2.3.2
Output
Level
Converter
The Model 620's
circuit
board
uses a
type
75150
line
driver
to
convert
the
TTL
levels
used
within
the
logic
circuits
into
+/-12V
levels
suitable
for use on
the
RS-232-C
interface.
These
circuits
can
withstand
output
short
circuits
to
any
low-impedance
voltage
within
the
RS-232-C
range
(+/-25V).
2.4
INTERFACE SIGNAL PIN ASSIGNMENTS
Table 2-1
lists
the
EIA RS-232-C
interface
connector
pin
assignments
that
are
used
by
the
Model 620. The
direction
of
signal flow
at
the
interface
is
indicated
by
arrows
in
the
table.
Table 2-2 provides a
pin-to-pin
wIrmg
list
for
the
internal
interface
cable
that
connects
from
the
EIA
I/O
connector
on
the
rear
panel
to
Interface
Connector
A121 on
the
circuit
board.
REV A (4/82) 2-1
TABLE
2-1
EIA INTERFACE CONNECTOR PIN ASSIGNMENTS
Signal Direction Pin
Terminal Modem Number CCITT TelCo Signal
!
.-
2 103
BA
-Transmitted
Data*
...,
3 104
BB
-Received Data *
..
4 105 CA +Request
To
Send
01(
6 107
CC
+Data Set Ready*
---------
7 102
AB
Signal
Ground
:
.-
20 108
CD
+Data Terminal Ready
*Notes:
In
those installations where
the
Model
620
is
to
be used with an
input
direct from
the
host
system rather than
thru
a modem,
the
user
must
ensure
the
following conditions:
1. The +DATA
SET
READY
input
must be held H I during data input.
2.
All
status
conditions required by
the
host
system must be satisfied.
3. The transmitted
data
from
the
Model
620
must
connect
to
the
received data
input
of
the
host
controller, and vice versa.
In
some cases, it may be necessary
to
alter
the
wiring
at
one end
of
the
I/O cable
to
exchange
the
two
wires connected
to
pins 2 and
3
of
the
I/O
connector.
TABLE 2-2
CABLE WIRING BETWEEN I/O and CIRCUIT BOARD CONNECTORS
I/O Pin
PCB
Pin Signal
2
A12l-7
-Tx
3
A12l-2
-Rx
4
A12l-6
+RTS
6
A12l-3
+DSR
7
A12l-l
GND
20
A12l-8
+DTR
2.5
INTERFACE SIGNAL DEFINITIONS
-Tx
This is
the
serial
ASCII-coded
digital
data
being
transmitted
by
the
Model
620. This line is in
the
"mark"
state
(LO)
between
characters,
rises for
logic 0 and drops for logic 1.
-Rx
+RTS
+DSR
GND
+DTR
This is
the
serial
ASCII-coded digital
data
being
received
by
the
Model 620.
This line must
be
held in
the
"mark"
state
(LO)
between
characters.
It
should go
HI
for logic 0, and
LO
for logic
1.
Held
HI
(+12V)
whenever power is
ON.
Must
be
ON
(HI)
for Model 620 operation in
Remote
mode. If OFF (LO), no
data
can be received. (Also
see
"Notes" for Table 2-1)
Ground
reference
for
all
other
interface
signals.
This signal from
the
Model 620 controls connection and disconnection of
the
data
communication equipment (the modem)
to
and from
the
communication
channel. The operation of this signal conforms
to
EIA
RS-232-C /'
specifica
tions.
2-2
REV
A (4/82)
SECTION 3
OPERATING CONSIDERATIONS
3.1
GENERAL
This section of
the
manual contains a
detailed
discussion of
the
operating
features
of
the
Model 620. The procedures for routine
operator
duties, such as changing ribbons and
print
wheels,
are
given in
detail
in
the
Model 620 Operators Guide and thus
are
not
repeated
here.
A few of the functions and operating
parameters
of
the
Model 620
are
controlled by
switches from
the
control
panel area. However, as an RO (Receive-Only)
terminal,
most
of
its functions and
operating
parameters
are
controlled by
Control
(CTRL) Codes and
Escape (ESC) sequences received via
the
interface.
Many of
the
ESC
sequences include 2-
and
3-character
CTRL codes. These CTRL Codes and
ESC
Sequences
are
summarized in
the
next
two sUbsections.
3.2
CONTROL (CTRL) CODES
The Model
620
responds
to
a
standard
set
of ASCII Control Codes. The
standard
ASCII
Code
Chart
shown in subsection
4.2
lists
the
Control
Characters
and
their
corresponding
ASCII Codes (although
the
operator
normally need
not
be
concerned
with
the
actual
codes
for
the
Control Characters). The Control
Characters,
as
they
apply
to
the
Model 620,
are
defined below. The keyboard (CTRL) codes given
are
those
generated
on a Logical-Bit-
Paired
keyboard.
ACK (CTRL F) (HEX
06)
-This code is used in conjunction with
ETX
for
the
ETX/ ACK
alternative
communication protocol. (See
subsection 3.4.2)
BEL
BS
CAN
CR
DC1
DC2
DC3
(CTRL
G)
(HEX
07)
-Updates all summarized motion and suspends processing
of
further
characters
until
all
printer
activity
is complete.
(CTRL H or BACKSPACE)
(HEX
08)
-Backspaces
the
carriage
one
print
position
(HMI)
in
normal mode, or 1/60" in Graphics mode. Direction of
movement
reverses
in
the
Backward
Print
mode. (see
subsection
3.7)
(CTRL
X)
(HEX 18) -This code is used in
the
sequence
ESC
CAN A or B
to
select
or
exit
the
high hammer energy mode.
(CTRL M
(CTRL Q)
(CTRL
R)
(CTRL
S)
or RETURN)
(HEX
OD)
-
(HEX 11) -
(HEX 12) -
(HEX 13) -
Causes a
carriage
return. If
the
Auto LF switch is ON,
a line
feed
operation
also occurs. (See SUbsection 3.5.1)
This code is used in conjunction with DC3
for
communication protocol. (See subsection 3.4.1)
Used in
the
sequence
ESC
SO
DC2
to
exit
down-load
mode.
This code is used in conjunction with DC1
for
communication protocol. (See SUbsection 3.4.1)
REV
A (4/82) 3-1
DC4 (CTRL T) (HEX 14) -
DEL (CTRL DEL) (HEX 7F)-
ENQ (CTRL
E)
(HEX 05) -
ESC
(CTRL])
(HEX IB) -
ETB (CTRL
W)
(HEX 17) -
ETX (CTRL C) (HEX 03) -
FF (CTRL
L)
(HEX
OC)
-
HT (CTRL
I)
(HEX 09) -
LF (CTRL LF) (HEX
OA)-
(or CTRL
J)
NAK (CTRL
U)
(HEX 15) -
NUL (CTRL I-8)(HEX 00)-
RS (CTRL
")
(HEX IE) -
SI (CTRL
0)
(HEX
OF)
-
SO
(CTRL
N)
(HEX
OE)
-
SP (CTRL SPACE)
(HEX
20)
-
STX (CTRL
B)
(HEX 02) -
SUB (CTRL Z) (HEX IA) -
US
(CTRL
-)
(HEX
IF)
-
VT
(CTRL
K)
(HEX
OB)
-
This code is used
to
exit
print
wheel down-load mode.
This
character
is used only
to
exit
Test
Mode in
Remote
Diagnostics.
It
can
be
used however
as
a
buffer
or
"sluff"
code
the
same
as
NUL.
This code is used in
the
sequence
ESC SUB ENQ
to
select
Test
Mode in
Remote
Diagnostics.
This
code
is always
received
as
the
first
character
of
a
2-
or
3-character
command
sequence.
(See sUbsection 3.3)
This code is used in
the
sequence
ESC ETB A
or
B
to
select
or
exit
the
single
strike
ribbon mode.
This
code
is used in
conjunction
with
ACK
for
the
ETX/ ACK
alternative
communication
protocol.
(See
subsection
3.4.2)
This
code
initiates
a
form
feed
to
the
top
of
the
next
form (page),
or
to
the
top
margin on
the
next
form
or
page
if
one is
set.
This
code
is used in
the
sequence
ESC HT n
for
absolute
horizontal
tab
to
column "n".
This
code
initiates
paper
movement
up 1 line. Movement
changes
to
1/48"
per
command
in
the
Graphics Mode.
This
code
is
transmitted
whenever
Down-Load mode is
aborted,
or
when
error
conditions exist.
This
code
is ignored by
the
Model 620.
It
can
be
used
as
a
buffer
or "sluff" code.
This
code
is used in
the
sequence
ESC
RS
n
to
set
VM1.
This
code
is used
to
clear
Program
Mode.
This
code
is used in
the
sequences
ESC
SO
M,
ESC
SO
DC2 and in
initiating
Test
Mode in
Remote
Diagnostics.-
This code
initiates
carriage
movement
one
print
position
(HMI) in
the
Normal
mode.
This code is used in
Remote
Diagnostics
Test
Mode.
This
code
is used
as
the
second
character
in ESC
sequences
for
remote
diagnostics
routines.
This
code
is used in
the
sequence
ESC
US
n
to
set
HM1.
This
code
is used in
the
sequence
ESC
VT
n
for
absolute
/
vertical
tab
to
line
"n". -
3-2
REV
A (4/82)
3.3
ESCAPE CODE SEQUENCES
The
Escape
(ESC) mode is
entered
by
receiving
the
ESC
control
code
over
the
communications
interface.
This
code
is always
received
as
the
first
character
of
a
2-
or
3-character
"Escape
Code Sequence". The
ESC
code conditions
the
Model 620 logic
to
receive
the
next
one or
two
characters
as
command
rather
than
print
data.
The
Model
620
immediately
executes
the
command
and
exits
the
Escape
Mode.
The
following
list
summarizes
the
ESC code
command
sequences.
(1)
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
ESC
Characters
(2) ill.
3"
4
5
6
9
o
a
b
c
d
C
CAN
CAN
CR
D
ETB
ETB
FF
HT
L
LF
P
Q
RS
S
SO
A
B
P
A
B
(n)
(n)
(n)
DC2
M
(one
I
R
1
SO
ENQ
(n)
(n)
REV
A (4/82)
Description
~
the
Command
Graphics mode
ON
(clear
with
CR)
Graphics mode OFF
Forward
Print
mode ON
Backward
Print
mode ON
(Forward
OFF)
(clear
with
CR)
Set
Left
Margin
(at
current
position)
***
Set
Right
Margin
(at
current
position)
***
Print Print
Wheel
Character
HEX
80
Print Print
Wheel
Character
HEX
81
Print
Print
Wheel
Character
HEX
82
Print Print
Wheel
Character
HEX
83
Clear
Top and
Bottom
Margins
High
Hammer
Energy Mode ON
High
Hammer
Energy Mode OFF
Initiate
Remote
RESET
Perform
Negative
Half-Line
Feed
Single
Strike
Ribbon Mode ON
Single
Strike
Ribbon Mode OFF
Set
Lines
Per
Page
to
(n)
**
Absolute HT
to
print
column (n)
**
Set
Bottom
Page
Margin
(at
current
position)
***
Perform
Negative
Line
Feed
Proportional
Space
ON
(clear
with
CR) *
Proportional
Space OFF *
Set
VMI
to
(n-1)
****
Return
HMI
control
to
internal
program
Enable
Print
Wheel Conversion
Table
Download Mode
(exit
with
DC4)
Program
Mode ON
(clear
with
sI)
of
the
following)
Enter
Remote
Diagnostic Mode
Remote
Initialization
Remote
Error
Reset
Remote
Status
1
Request
Remote
RAM/ROM TEST
Remote
Test
Mode
Set
Top
Page
Margin
(at
current
position)
***
Perform
Half-Line
Feed
Set
HMI
to
(n-1)
****
Absolute
VT
to
print
line
(n)
**
Print
Print
Wheel
Character
HEX
20
Print
Print
Wheel
Character
HEX 7F
Enable Auto Backward
Printing
Disable
Auto
Backward
Printing
(continued
next
page)
3-3
* = Model 620
automatically
enters
Proportional Space Printing Mode when a PS
Print
Wheel is installed. This command enables proportional
space
printing
with
a Non-PS
print
wheel.
**
= See subsection 4.4, Table 4-2 for ASCII
character
values for
setting
Absolute
Tabs and Lines
Per
Page.
***
=
Left
and Right
MARGIN
positions must
be
arrived
at
using SPACE
or
BACKSPACE commands FROM
Carriage
Home (RESET) position. Top and
Bottom MARGIN post ions must be
arrived
at
using LINE FEED commands FROM
the
manually
set
Top Of Form position.
****
= See subsection 4.4, Table 4-1 for ASCII values in
setting
HMI
and
VMI.
3.4 COMMUNICATION PROTOCOLS
The print
buffer
in
the
Model
620
has a
capacity
of
512
bytes. The communications
protocols
prevent
print
buffer
overflow when
print
data
is being
received
faster
than
the
printer
can print.
3.4.1 DC1/DC3
Protocol
(XON/XOFF)
This protocol is switch
selectable
opposite
Printer
Ready. With DC1/DC3
protocol
selected,
a DC3
control
code
character
is
transmitted
by
the
Model 620 when
the
PAUSE
switch is pressed or when printing is
attempted
under any
of
the
following conditions:
1.
Print
buffer
nearly full (within
64
bytes)
2.
Printer
in check (POWER
light
flashing)
Once a DC3 has been
transmitted,
the
Model 620 will
transmit
a DC1
character
when
1)
the
print
buffer
is nearly
empty
(within
64
bytes), or
2)
when
either
the
PAUSE or
the
printer
check condition has been
cleared
by pressing
the
RESET switch.
3.4.2
ETX/ ACK Protocol
The Model
620
will respond
to
the
ETX/ ACK
protocol
at
all times. In this mode,
the
host
system maintains
the
printer's
print
buffer. When
it
sends a
string
of
print
data,
it
includes an ETX
control
character
at
the
end. When
the
ETX
character
is
retrieved
from
the
buffer by
the
printer
logic,
the
Model 620
transmits
an ACK
character
back
to
the
host system
to
indicate
it
is
ready
to
accept
more
data.
3.4.3 PRINTER READY PROTOCOL
This protocol is
switch
selectable
opposite DC1/DC3.
Printer
Ready protocol uses a
dedicated
interface
line
(Data
Terminal Ready -I/O Pin 20)
instead
of
special
control
characters.
When
Printer
Ready
protocol
is
selected,
the
output
on Pin
20
(now
representing +PRINTER READY) goes
LO
when printing is
attempted
under any
of
the
following conditions:
1.
Print
buffer
becomes nearly full (within
64
bytes)
2.
Printer
in check (POWER light flashing)
The +PRINTER READY signal
returns
HI
when 1)
the
print
buffer
becomes nearly
empty
(within
64
bytes), or
2)
the
Printer-in-Check
condition has
been
cleared
by pressing
the
RESET switch.
When
the
Control
Panel
DIP
switch #5 is
set
for DC1/DC3,
the
Data
Terminal Ready
interface
line (Pin 20) is held
HI
as long as
correct
power is applied
to
the
unit.
3-4
REV
A (4/82)
3.5 OPERATOR CONTROL PANEL
-
120010PT
r;;c:c;-
110/300-
12
....
CD
11
PAGE
SIZE
ON
IIlCCl
AUTO
LF
ON
Il'Ic::c::I
SELF
TEST
PTR/ROY"'CD
Del/DC3
PARITV-c;,g~
~
~~:N
110112oo
..
cg
300/0PT-
-=-BAUD_
Figure
3-1
o [
~~:~
l[
~~~~
lBB
POWER
OPERATOR CONTROL PANEL
The
layout
of
the
Operator
Control
Panel
is
illustrated
in
Figure
3-1.
The
eight
slide
switches
are
used
to
select
some
of
the
basic and seldom
changed
operating
parameters.
The four command
switches
allow
the
operator
to
intervene
in
printer
operation.
3.5.1 Slide
Switches
These
switches
are
located
to
the
left
of
the
Command
switches
and
are
under
the
front
access
cover
when
it
is
installed
Their
purpose is for
tailoring
the
Model 620
operating
modes
to
more
nearly
suit
the
user's application. Once
set
they
are
ordinarily
left
alone
unless
the
operating
situation
changes.
SWITCH #8
1200/0PT-110/300
-This
switch
is used in conjunction
with
Switch
#1
to
select
either
the
baud
rate
at
which
the
Model 620 will
receive
and
transmit
data,
or an
optional
operating
mode.
SWITCH #7 12-11 PAGE SIZE -This
switch
enables
setting
of
page
size,
used in
the
Top Of
Form/Form
Feed
functions,
to
either
the
US
standard
l1".or
the
European
standard
of
approximately
12"
page
length.
SWITCH #6 ON-AUTO LF -When on,
this
switch
enables
the
Model 620
to
automatically
advance
the
paper
one line
with
each
carriage
return.
This
relieves
the
host
system
of
the
need
to
send
a line
feed
command
with
each
carriage
return
command.
SWITCH #5 ON-SELF TEST -Normally
this
switch
will
be
used only by your
Service
Technician.
If
this
switch
is ON when
the
Model 620 is
turned
on,
the
unit
will
enter
its
self
test
mode and begin
sequencing
thru
its
self
test
program.
The PAUSE and RESET Command
Switches
may
be
used
to
interrupt
and
restart
the
self
test
sequence.
To
exit
the
mode,
the
SELF TEST
switch
must
be
moved
to
OFF and
the
power
to
the
Model
620
turned
off
momentarily.
SWITCH #4 PTR RDY-DC1/DC3 -In addition
to
the
ETX/ACK
communications
protocol
which is always enabled,
this
switch
allows
selection
between
Printer
Ready
and
DCl/DC3
communications
protocols.
SWITCH #3 PARITY ON/OFF -When on,
this
switch
enables
parity
checking
and
parity
information
transmission.
SWITCH #2 PARITY ODD-EVEN -This
switch
is used in
conjunction
with
PARITY
REV A (4/82)
ON-OFF
to
determine
the
nature
of
parity
information
handling.
If
Parity
is OFF,
this
switch
determines
if
the
transmitted
parity
bit
is
always a
space
(odd)
or
a
mark
(even).
3-5
SWITCH #1 110/1200-300/0PT -With Switch #8 in
the
"110/300" position, this switch
selects
110 or 300 Baud as
the
speed
at
which
the
Model 620 will
receive or
transmit
data. With Switch #8 in
the
"1200/0PT"
position,
this switch
selects
either
1200 Baud
as
the
operating
speed
or
an
optional
operating
mode.
3.5.2 Command Switches
These membrane
type
"touch" switches
are
always available
to
the
operator
for use in
controlling
printer
operation.
FORM FEED -
LINE FEED -
PAUSE -
RESET -
Pressing this switch causes
the
Model 620 to advance
the
paper or form
to
the
next top-of-form position. A form feed code is
not
transmitted
Pressing this switch causes
the
Model 620
to
advance
the
paper
or form
one line. Holding
the
pressure on
the
switch longer
than
about 1/2
second will
cause
the
line feed
operation
to
repeat.
A line
feed
code is
not
transmitted.
Pressing this switch will cause
the
Model 620
to
stop printing without
loss of
data,
drives
Printer
Ready signal LO, and causes
the
DC3 signal
to be
transmitted.
The POWER
indicator
will go out. Printing is
resumed, and
the
POWER indicator will
come
back on, when
the
RESET
switch is pressed.
This switch has
three
functions, depending on
the
Model 620's
situation
at
the
time
it
was pressed: a)
It
will
clear
an "error" indication and
b)
return
the
Model 620 to operation; or c)
return
the
Model 620
to
operation following a PAUSE command
(Printer
Ready signal HI,
transmit
DC1 signa!).
3.5.3 The Power Indicator
The POWER indicator glows whenever power is
turned
on
to
the
Model 620. The indicator
will
commence
flashing
on
and
off
whenever any
of
the
following conditions
are
present:
a) A
parity
error
was
detected
with PARITY switch on;
b)
The print
buffer
(memory) has
overflowed; or c) The
status
signal
"Data
Set
Ready" is false. The
indicator
goes
out
during a PAUSE activity.
3.6
PRINTING FORMAT
Printing
format
is dependent on
three
main
factors;
horizontal
character
spacing,
vertical
line spacing, and number of lines
per
page. Each
of
these
factors
can
be
independently
controlled. Any point on a page can be defined in
terms
of
a "horizontal position" and a
"vertical
position". The number of lines
per
page
can
easily be changed when necessary.
3.6.1 Definition of Terms
Figure 3-2 and
the
text
following describe some
of
the
points
associated
with
a simple
page layout.
3-6
REV
A (4/82)
*FORM
FEEO
TO
HERE
VERTICAL
POSITION
0-15,750
HORIZONTAL
POSITION
0-1572
(I/120"INCR)------I
r-----------------------r------,
I"\op
OF
FORM
t
(TOF) I
*SETABLE
TOP
MARGIN
:
FORM
FEED
TO
HERE
I
POSITIVE
HORIZONTAL
MCPlEMENT-
----
NEGATIVE
HORIZONTAL
MOVEMENT
rPOSITIVE
VERTICAL
MOVEMENT
LNEGATIVE
VERTICAL
MOVEMENT
Width
of
Print Position = Horizontal Motion Index (HMO and
is
variable from 0
to
125111120")
increments.
Print Position Number = Horizontal Position + 1 = Horizontal
Tab
Position.
Tab
Positions limited
to
first
160
HMI
Print Positions.
Height of Line = Vertical Motion Index (VMI) and
is
variable
from
0
to
125
11/48") increments.
Line
Number
= Vertical Position + 1 = Vertical
Tab
Position. Total
number
of
lines can
be
specified
VMI
from
1
to
126.
Page Size = Number
of
lines x VMI.
*
If
a
top
margin
is
set. the Form Feed will advance
beyond
the
Top
of
Form
to
the
top
margin.
Note: Movement arrows
depict
carriage movement relative
to
paper and
not
actual paper movement direction.
(I/4S"INCR)
_.
-'-
__
:~~~~~~~~~~~rtL
~~y~~~NJ:
NOT
POSSIBLE: I
PAGE
SIZE
*NEXTFORM
FEED
TO
HERE
I
I
,
I
I
,
5ETABLE I
1-1
-----
LEFT
I
!
rA~~r..S:-------l1
I
I I
1...
___
--
--
-
--
- -
--
---------1----...1
SETABLE
LOWER
MARGIN
Figure
3-2 PAGE LAYOUT
AND
PRINTING FORMAT
ORIGIN: The position
of
the
print
head
following a Form
Feed
(with no
top
margin
set)
and
an
Absolute
Horizontal
Tab
to
position
0.
The
first
print
position on
the
first
line
of
a page.
HORIZONTAL MOTION INDEX (HMI): The
distance
that
the
carriage
moves
after
1/120
printing
a
character
(or when spacing). This
distance
is in multiples
of
inch. Minimum
HMI
is 0, maximum is 125.
VERTICAL MOTION INDEX
(VMI):
The
distance
moved by
the
paper
(platen) for
each
is 0,
line
feed,
etc.
This
distance
is in multiples
of
1/48 inch. Minimum
VMI
maximum is 125. When
VMI=O,
no
paper
movement
occurs.
HORIZONTAL POSITION: The
horizontal
distance
(in
1/120
inch
increments)
between
the
print
head and
the
origin. Minimum
horizontal
position = 0, maximum =
1572.
VERTICAL POSITION: The
vertical
distance
(in 1/48 inch
increments)
between
the
current
print
line and
the
first
line on
the
page
(the
origin). Minimum
vertical
position = 0, maximum = 15,750.
PRINT POSITION: The
horizontal
area
capable
of
being
occupied
by a single
printed
LINE:
character.
This
can
be
likened
to
a
print
"column" on a line
printer,
except
that
it
is variable: The number
of
print
positions
per
line is
dependent
upon
the
HML
The minimum
number
of
print
positions
per
line
is 13 (when HMI=125):
the
maximum number is 1573 (when HMI=l). The
leftmost
print
position is position
1.
Print
Position No. =
Horizontal
Position
+1
HMI
The
vertical
distance
capable
of
being occupied by a row
of
printed
characters.
The
height
from one
line
to
the
next
is equal
to
VMI.
Line
number
may
be
calculated
as
follows:
Line No. =
Vertical
Position
+1
VMI
REV
A (4/82) 3-7
LINES
PER PAGE: The
actual
number
of
print
lines
per
page
of
paper. Lines
per
page
can
be
set
to
any number from 1
thru
126.
3.6.2
Standard Printing
Formats
The Model 620
can
produce a printed
output
in
anyone
of
three
standard
formats
(10, 12
and 15 pitch), and proportional space. These
formats
are
summarized
in Table 3-1.
TABLE
3-1
STANDARD &
PS
PRINTING FORMATS
Horizontal Spacing Vertical Spacing
PITCH Char/in Char/Line (Max) HMI Lines/in Lines/pg
VMI
11
"
12"
10
10
132 12 6
66
72 8
12
12
158 10 6
66
72 8
15
15
197 8 6
66
72 8
PS
--
12
6
66
72 8
The
correct
print
format
is established for
the
printer
from information encoded on
the
printwheel installed. Proportional Space printing is discussed in
the
next
subsection.
3.6.3
Proportional Space Printing
The Proportional Space mode is
selected
by
the
Model 620 when
the
proper encoding
sequence is
detected
froIl) information encoded on a PS printwheel. If
the
unit is in
the
Remote
HMI
mode,
the
PS
data
is ignored. When Proportional Space is enabled,
HMI
is
set
to
12
pitch.
The sequence ESC P may be used
to
initiate
proportional
space
mode
remotely,
while
ESC
Q will cause
the
Model
620
to
exit
proportional
space
mode. Once
either
of
these
ESC
sequences has
been
received,
the
Model 620 will ignore print wheel
pitch
data
until
the
sequence
ESC
S is received.
HMI
may
be
changed
at
any
time
by executing
ESC
US
(n).
Proportional
space
printing is accomplished by move,
print,
move. This differs from
normal
printing which is
print
before move. The
size
of
the
moves
are
equal
to
the
sum of
the
PS
values of two
adjacent
characters,
plus
offset.
The
size
of
space
is 10/120
11
• The
size
of
backspace is
determined
by
the
last
printed
character
(or
space
if
that
character
was
last).
Entering and
exiting
proportional
space
mode via
the
Escape sequences does
not
change
HMI.
Normal processing
of
all
control
codes and
escape
sequences continues in
proportional space mode. NOTE:
HMI
is used only for tabbing and word
space
(space and
backspace).
3.6.4 Optional Printing
Formats
Any
of
the
three
format
factors
(character
spacing, line spacing and lines
per
page)
can
be
altered,
along with hammer energy and ribbon advance, by utilizing
special
escape (ESC)
sequences. The
Remote
Reset
(ESC
CR
p)
sequence
cancels
all
optional
format
factors,
and returns
the
unit
to
its
own
selected
format.
Execution
of
any
of
these
sequences does
not
immediately
alter
horizontal or
vertical
position.
It
does however change subsequent operations by redefining
the
variable
format
factors.
It
is recommended
that
a Form
Feed
and
an
Absolute Tab
to
location 0
be
performed
prior
to
changing any
format
factors.
3-8
REV
A (4/82)
3.6.4.1 Variable
HMI
The
standard
HMI
can
be
altered
by executing
the
3-character
sequence ESC
US
(ASCII
character),
where
the
binary value of
the
ASCII
character
is one
greater
than
the
number
of
increments
(1/120")
the
carriage
will move
after
printing a
character
or when spacing.
See subsection 4.4, Table 4-1
to
determine
the
appropriate ASCII
character
to
be
used.
HMI
= (ASCn
character
-1) x 1/120"
NUL
and DEL
characters
cannot
be
used, so minimum
HMI
is 0, and maximum is 125
increments.
This
places
the
terminal
in
the
remote
HMI
mode.
HMI
is
returned
to
the
standard
format
by
executing
the
2-character
sequence
ESC
S.
This places
the
unit in
the
local
HMI
mode.
NOTE:
Print
Wheel designated PITCH is ignored in
Remote
HMI
mode.
3.6.4.2 Variable
VMI
The
standard
VMI
can
be
altered
by executing
the
3-character
sequence ESC
RS
(ASCII
character),
where
the
binary value of
the
ASCII
character
is one
greater
than
the
number
of
increments
(1/48")
the
paper
will move for
each
line feed,
negative
line feed,
etc.
Minimum
VMI
is 0, maximum is 125. See sUbsection 4.4, Table 4-1
to
determine
the
appropriate
ASCn
character
to
be used.
VMI
= (ASCn
character
-1) x 1/48"
3.6.4.3 Lines
Per
Page
The number
of
lines per page
can
be
altered
by executing
the
3-character
sequence
ESC
FF
(ASCn
character),
where
the
binary value
of
the
ASCII
character
is equal
to
the
number
of
lines per page desired. Minimum number
of
lines
per
page is 1, maximum is
126. See sUbsection 4.4, Table 4-2
to
determine
the
appropriate
ASCII
character
to
be
used.
3.6.4.4 Hammer Energy/Ribbon Advance
Hammer Energy -The sequence
ESC
CAN
A enables shifting hammer energy levels 1-3
to
levels
2-4 when needed to
compensate
for lower
than
normal
hammer
energy due
to
below
normal line voltage levels. Level 4 is unchanged. This mode is
exited
with
the
sequence
ESC CAN
B.
Ribbon Advance -The sequence
ESC
ETB
A enables a ribbon advance mode
to
support
the
use
of
single
strike
ribbons. This mode is
exited
with
the
sequence ESC
ETB
B.
Single
strike
ribbons
are
often
used where a very dense
printout
is required, as with
direct
application to
offset
printing.
3.7
FORWARD/BACKWARD PRINTING
3.7.1 Auto Backward Printing
The Model
620
defaults
to
Auto Backward Printing Mode when initialized. Auto Backward
Printing is disabled by
the
sequence
ESC
\,
and reenabled by
the
sequence ESC I.
Forced
backward printing is enabled by
the
sequence
ESC
6 which overrides Auto backward
printing.
When
enabled, Auto Backward Printing will
print
a line
of
text
in
the
reverse
direction only when
all
the
following requirements
are
met:
REV
A (4/82) 3-9
1. Printing is
at
least
one line behind print-queued
data.
2.
The line in question contains less
then
256
characters
following
the
first
printable
character.
3.
If
the
end
of
the
line is
the
shortest
distance for
carriage
motion.
4.
No
ESC
sequences or
control
characters
are
embedded within
the
line of
text.
When all
of
the
above contitions
are
satisfied
the
Model 620 will
automatically
go into
Auto Backward Printing mode.
3.7.2 Programmed Backward Printing
To
take
advantage
of
the
Model 620's backward printing capability,
the
system
utilizes
both
a Forward and a Backward
Print
Mode. The Backward Printing Mode is enabled in
the
Model 620 when
the
sequence
ESC
6 is received, and disabled when
the
sequence
ESC
5 or
a
CR
is
received
Disabling Backward Printing Mode re-establishes
the
Forward
Print
Mode.
During Forward
Print,
each
character
printed also causes
incremental
carriage
movement
to
the
right. (Note exception during GRAPHICS mode.) During backward
print
this motion is
reversed,
moving
the
carriage
to
the
left.
The
action
of
the
Space and Backspace codes
are
also reversed in Backward Print. Note, however,
that
tabbing operations,
carriage
return,
and all paper movement functions
are
not
affected
by being in
the
Backward
Print
Mode.
3.8
MARGIN CONTROL
3.8.1 Horizontal Margins
Both
the
left
and
right
margins
can
be adjusted by positioning
the
carriage
to
the
desired
print
position, and
then
sending
an
ESC
9 (for
left
margin) or
ESC
0 (for
right
margin).
Altering
the
left
margin causes
the
carriage
to
return
to
the
new margin position following
a
carriage
return
(CR). The
carriage
can be moved
to
the
left
beyond
the
new
left
margin position by any
of
the
following methods (new
left
margin must
be
at
a position
greater
then
1):
1.
Absolute Horizontal Tab
2.
Backspacing
3.
Spacing in Backward
Print
Mode
A power-on or
Remote
RESET operation will
automatically
clear
the
left
margin
to
horizontal
position 0 and
the
right
margin
to
horizontal
position 1572.
3.8.2 Vertical Margins
Both
top
and
bottom
page margins can
be
adjusted by positioning
the
print
head on
the
desired line, and
then
sending an
ESC
T (for top margin) or
ESC
L (for
bottom
margin).
The
bottom
margin must
be
set
below
the
top
margin, and both must
be
within
the
page
size
boundaries.
Whenever a
bottom
page margin is crossed with a line feed,
auto
line
feed
or half line
feed,
the
paper
will
be
automatically
advanced
to
the
top margin on
the
next
page. The
Form
Feed
command is not needed for this
activity.
The
area
between
the
bottom
margin
of
one page and
the
top
of
form of
the
next
page
can
be
accessed using
vertical
tabs
(absolute or normal), and
thru
negative
line feeds.
3-10
REV
A (4/82)
3.9
TABBING
The Model 620
utilizes
"Absolute Tabbing" only. The "Absolute Tab" is unique in
that
it
does not require prior
setting
of
tab
stops, and allows
automatic
positioning of
the
carriage
or paper to any of
the
first 126 positions horizontally or vertically.
This method
of
tabbing provides horizontal and
vertical
positioning
to
standard
print
positions or lines. This makes
it
possible,
thru
utilization of variable indexing,
to
print
data
out in any
format
desired, without prior editing. For example,
data
that
was
originally
formatted
for
10
characters
per
inch, 6 lines per inch,
can
be
printed
out
at
15
characters
per
inch, 4 lines per inch (or any
other
format), and all
tabular
material
will
remain in
the
same
relative
position
as
when
it
was
first
formatted.
Absolute tabbing is
initiated
by an
ESC
HT
(for horizontal) or
ESC
VT
(for
vertical)
sequence. Since tabbing provides positioning only to normal print positions and lines, finer
positioning requires
the
use of spacing and line feeding in GRAPHICS mode. All tabbing
functions
are
unchanged in GRAPHICS. When returning
to
normal
print
mode or during
graphics mode, when a
tab
is encountered
the
present
position is assumed
to
be
a column
position. This will
remain
until a
carriage
return
or subsequent graphics move occurs.
3.9.1
Absolute Horizontal Tab
Using Absolute Horizontal Tab,
the
carriage
can
be positioned
directly
to
any
of
the
first
126 print positions without
the
need for prior
setting
of
tab
stops. This is accomplished by
executing
the
sequence
ESC
HT
(ASCII
character)
where
the
binary value of
the
ASCII
character
selected
indicates
the
print
position desired. See SUbsection 4.4, Table 4-2 for
the
appropriate
ASCII
character
to be used.
Note
that
this method
of
tabbing also makes possible tabbing
to
the
left.
For
example,
with
the
carriage
positioned
at
print
position 100, and
ESC
HT
1 sequence will move
the
carriage
directly
to
print
position 49,
the
binary value
of
the
ASCII code for digit 1. The
leftmost
print position is considered
to
be
binary location
1.
Any ASCII
character
other
than
NUL
and DEL can be used, making possible
direct
tabbing
to
any
of
the
first
126
columns. The horizontal position
at
the
completion
of
an Absolute Tab
operation
is
computed as follows:
Horizontal Position = (ASCII
character
-1) x
HMI
3.9.2 Absolute
Vertical
Tab
Using Absolute
Vertical
Tab,
the
form
can
be
moved
directly
to
anyone
of
the
either
66
or
76
lines
per
page from any
other
line.
It
is not possible
to
tab
beyond
the
end
of
the
page however, even though
the
maximum value is 126. Absolute
Vertical
Tab is
initiated
by executing
the
sequence
ESC
VT
(ASCII
character)
where
the
binary value of
the
ASCII
character
selected
determines
the
number
of
the
line to be reached. The top line of
the
form is assigned
the
binary value
of
1, and each successive line down
the
page is
called
out by
the
next
higher binary value. The
actual
amount
of
paper
(platen) movement is
determined by (a) form position
before
VT
execution,
(b)
the
ASCII
character
used, and (c)
the
Vertical Motion Index
(VMI).
Ultimate
position is
determined
by
the
formula:
Vertical Position = (ASCII
character
-1) x
VMI.
See subsection 4.4, Table 4-2 for
the
appropriate
ASCII
character
to
be
used.
REV
A (4/82) 3-11
3.10 LINE FEED
A Line
Feed
switch command from
the
control
panel or a (LF) code received over
the
communications link will cause
the
paper
or form to move up one line (one
VMI).
An
ESC
LF sequence commands a negative line feed, causing
the
paper or form
to
move down one
line. See also subsection 3.13 GRAPHICS.
3.11
HALF LINE FEED
A Half-Line
Feed
command sequence
ESC
U causes
the
paper or form
to
move up
1/2
line
(1/2
VMI).
A Negative Half-Line Feed command sequence
ESC
D causes
the
paper or form
to move down 1/2 line. These two commands
are
unchanged in GRAPHICS Mode.
If
VMI
is
set
to some odd number,
the
total
paper movement will be one
increment
(1/48") less
than
1/2
line.
--
3.12 FORM FEED
A Form
Feed
switch command from
the
control
panel or a (FF) code received over
the
communications link will cause
the
paper or form
to
move
up
either
to
the
first
line or
the
top margin
of
the
next
page if one has been
set.
3.13 GRAPHICS
An
ESC
3 sequence received over
the
communications link will put
the
Model 620 into
GRAPHICS Mode. A carriage
return
(CR) or
ESC
4 sequence will
return
the
unit
to
its
normal mode. While in
the
Graphics mode,
carriage
movement is completely divorced from
printing: i.e. printing a
character
does
not
automatically move
the
carriage. The
carriage
can be moved only by executing a
tab,
space,
carriage
return,
or backspace operation. The
tab
commands
operate
the
same
as
they
do
in Normal mode. Space and Backspace
commands, however, move
the
carriage
only
1/60"
regardless
of
the
selected
HMI.
Similarly, Line
Feed
and Negative Line
Feed
commands move
the
paper only
1/48"
instead
of
the
selected
VMI.
Vertical Tab, Form Feed, Half-Line and Negative Half-Line
operations remain unchanged in Graphics Mode.
3.14 RESET/INTITIALIZATION
When
power is applied, or when
the
remote
reset
command sequence
ESC
CR P is
received
and executed,
the
Model
620
defaults
its
parameters
according
to
its
configuration
as
follows:
Normal
Print
Mode
(not Graphics)
Auto Backward Printing
Carriage
to
Print Position 0
Vertical
Position
cleared
to
0 (paper does not move)
VMI
set
to
8
(6
lines per inch)
Lines per page
set
to
66
or 72 based on switch
selection
Left
margin
set
to position 0
Right margin
set
to position 1572
Top margin
set
to
position 0 (line 1)
Bottom margin
set
to position
528
or
576
based on
selected
page
size
Send and print buffers
cleared
3.15 PROGRAM
MODE
Program mode provides user control
of
spoke position, hammer energy, and ribbon advance,
thus allowing
the
use
of
special print wheels without modification
to
the
terminal
In
3-12
REV
A (4/82)
Program Mode, two
characters
are
sent
to
the
Model 620 for
each
character
that
is
to
be
printed. The
first
of
these
characters
selects
the
print wheel spoke, while
the
second
character
establishes
the
hammer energy and proportional
space
value
that
is
to
be
used.
Spacing is controlled by
HMI
plus off3et.
If
the
Model
620
is in proportional
space
mode,
spacing is controlled by
the
P.S. value (move 1/2 PS value,
print,
move
1/2
PS value) plus
offset.
Program Mode is
initiated
by
the
sequence
ESC
SO
M,
and
turned
off
by
either
receipt
of
the
control
character
~
or cycling power
off
and on.
3.15.1 Spoke Position
Data
The
first
character
received is
tested
to
determine
if
it
is a
control
character
or a spoke
position
character.
Spoke Position
Character
= Spoke Position +
32
If
it
is a
control
character,
the
normal processing of
control
characters
will occur.
If
it
is
not
a
control
character,
it
is assumed
to
be
a spoke position
character,
and
the
next
character
will
not
be
tested
for
control
character
status.
Note
that
only 94 spoke position
chartacters
can
be
distinguished from
control
characters.
Spokes 1, 2, 87, 95,
97
and
99
can
be
accessed by
the
ESC
sequences shown in Figure 4-2.
3.15.2 Hammer Energy/Ribbon Advance
Data
The second
character
in
the
sequence is
the
Hammer Energy/PS Value
character.
The
proper ribbon advance is
determined
by
the
PS value. The second
character
contains 4 bits
(0-3) for
PS
value and 3 bits (4-6) for hammer energy. This provides
16
different
PS
values and 5
different
hammer energy levels (0-4). The
hammer
energy
level
definitions
are
as follows:
Level 0 =
Do
not
fire
hammer
Level 1 = Lowest hammer energy}
Level 2 =
Low
hammer
energy (see also SUbsection 3.6.4.4)
Level 3 = High ham m
er
energy
Level 4 = Highest hammer energy
This
feature
allows
the
user
to
tailor
print
quality and ribbon economy as desired. The
general
criteria
for
selecting
the
amount
of
hammer energy and ribbon advance is
to
use
the
lowest hammer energy and
the
minimum ribbon advance
that
will produce a
level
of
print
quality
suitable for
the
intended application. The use
of
excessive
hammer
energies
will unnecessarily
shorten
the
useful
life
of
the
affected
,print wheels.
The
Print
Wheel
Data
Book (Diablo Publication
No.
90044-XX) provides users with
specific
information
on
each covered
print
wheel. This includes spoke addresses both by spoke and
HEX
code, recommended hammer energy and
PS
value.
3.16 PRINT
WHEEL
TABLE DOWN-LOAD FEATURE
3.16.1 General
The Down-Load
feature
of
the
Model 620 provides a means by which
the
host
system
can
write a
temporary
print
wheel "lookup table" into
the
read-write
(RAM) memory of
the
Model 620. This
temporary
table
can
be
tailored by
the
host
system
to
specifically
support
REV
A (4/82) 3-13
any
print wheel available for
the
Model 620 and
not
already
supported by
its
resident
firmware.
It
should include
the
following
print
wheel
data
for
each
of
the
100
printable
character
positions:
Hammer energy for
the
character
Proportional space units for
the
character
Spoke position
of
the
character
Ribbon advance units for
the
character
Whether or not
it
is a printable spoke position on this
print
wheel
Each
time
one
of
the
100
potentially-printable
ASCII
characters
is
received
over
the
interface
in
the
normal printing mode,
the
Model 620's microprocessor
refers
to
a
particular
location in
the
selected
lookup
table
to
obtain
the
proper
print
data
for
that
character.
The descriptions given here
prescribe
the
format
and protocol necessary
for
down-loading a
print
wheel
table
into
the
firmware
to
temporarily
replace
the
imbedded
print
wheel tables. However, host
system
design
to
assemble
the
table
and implement
actual
down-loading will vary with
the
system and with user
preferences.
r-----------
DOWN-LOAD MODE
----
---
-
--
--,
I (MUL TlPLE RECORDS) I
I I
I I
!
~~~~~'!-.
I
f
~
~
~T
ESC
SO
DC2
ACK ACK
ACK
DC4
lENTER DOWN·LOAD MODE) (EXIT DOWN·
LOAD MODE)
r-----------
DOWN-LOAD MODE
-------------,
I (SINGLE RECORD) I
I I
I I
I I
) RECORD
1/
. I
T~
}-II
t
ESC
SO DC2
ACK
DC4
NOTE: The total amount
of
Table Data stored by either a Single-Record Down-Load
or
Multiple-Record
Down-Load;s 200 bytes (2 bytes
for
each
of
the 100 possible spoke
~osjtions).
Figure 3-3 DOWN-LOAD VARIATIONS
The diagrams in Figure 3-3
represent
two variations of
the
down-load procedure: down-
loading
the
table
by a single record, and down-loading by multiple records. The required
record
format
is described in
the
following SUbsection. Subject
to
user
preference,
the
complete
print
wheel
table
can be down-loaded within a single
record,
or
the
table
can
be
loaded in
segments
by a
series
of
records. Smaller
records
are
more easily debugged
if
errors
in
data
format
occur,
but
otherwise
the
multiple-record method has no significant
advantage
over single-record down-loading.
The down-load mode is
entered
with
the
sequence
ESC
SO
DC2, and
can
be
exited
with
the
single
control
character
DC4. Once
the
down-load procedure has been
completed
successfully,
the
down-loaded
table
is
automatically
selected
for
print
wheel support.
Reselection
of one
of
the
resident
tables
can
be
made by
reentering
down-load mode and
sending an invalid record, or defaulted
to
by sending a
remote
RESET command or cycling
power.
3-14
REV
A (4/82)
FORMAT
"5'
"1'
0---<
0---<
0---<
0---<
t----t
~
>---i
~
>-----i
>-----i
>-----i
t----t
I-t
-~
FUNCTION
Record Start Character
Record Type Character
Byte
Count
12
Hex Characters)
load
Start
Address (4 Hex Characters)
Table Data (4 Hex Characters per table entry)
"
/"
[oj
~."
"-'"--
Notes:
1.1----1
= One
Hex
Character
2.
The
"Hex"
characters designated
in
this diagram are ASCII characters,
from the host, representing Hexadecimal values.
Figure 3-4 DOWN-LOAD RECORD FORMAT
3.16.2 Down-Load
Data
Record
Format
The
table
is down-loaded using a hexadecimal blocked
record
structure
as
depicted
in
Figure 3-4. This
format
is similar to
other
common down-load
structures.
A "record"
consists
of
a
record
start
character,
a
record
type
character,
a
byte
count, a load address,
the
table
data,
and a checksum. Each
of
these
elements
is described in
detail
and
demonstrated
by
the
printout
of
an
actual
down-load
structure.
If
no
error
in
data
format
is
detected
while receiving
the
record,
the
Model 620 will
transmit
an ACK
character
immediately
following
receipt
of
the
end
of
the
record.
An
error
in
data
format
is
detected
if
the
unit
receives
any
character
other
than
the
hex
characters
0
thru
9 and A
thru
F,
or if
the
checksum does
not
compare
correctly
against
the
data
received
If an
error
in
data
format
is
detected,
the
Model 620
immediately
transmits
a
NAK
character,
exits down-load mode, and
defaults
table
selection
to
resident
print
wheel tables. Note
that
the
"hex
characters"
referred
to
throughout this description
are
represented
by
standard
7-bit
l\,SCn
characters
0-9 and A-F from
the
host system.
These
characters
are
translated
internally by
the
Model 620 into
standard
4-bit
hexadecimal
characters.
3.16.2.1 Record
Start
Character
The
record
start
character
is an
ASCII
"S". Any
data
encountered
before
the
"s"
will
be
ignored. This allows
carriage
returns
and line feeds, or
other
characters,
to
be
embedded
before,
after
or
between
data
records. These embedded
characters
will
not
affect
the
down...,.load
process,
but
do allow
appropriate
formatting
of
the
printout
if a hard-copy
reference
of
the
down-load records is
outputted
thru
the
printer
(see sUbsection 3.16.4).
3.16.2.2 Record Type
Character
The
record
type
character
must
be
an ASCII "1".
In
other
similar down-load
structures,
the
record type
character
may also be a
"0"
(llheader record") or a "9" ("end-of-file
record").
In
the Model 620, a
record
identified
as
type 0
or
9 will simply
be
ignored. Any
character
other
than
a 0, 1 or 9 is
detected
as a down-load
error
which causes
the
unit
to
transmit
a
NAK
character
and
exit
the
down-load mode.
Print
Wheel Table
selection
then
defaul ts to
the
resident tables.
REV
A (4/82) 3-15
3.16.2.3 Byte Count
The
byte
count consists of two hex
characters
that
specify
the
number
of
data
bytes
to
follow, including
the
address and checksum. Because
the
byte
count is based on a system
of
two
4-bit
hex
characters
per
byte,
the
record
will contain twice
as
many hex
characters
as
the
number specified by
the
byte
count.
MEMORY ACCESSED
BY
TABLE ADDRESS HEX CODE
DATA* (Hex) (from Host)
STARTS Byte 0040 J ESC Y **
Byte 0041
Byte
0042J
21
Byte 0043
Byte
0044J
22
Byte 0045
Byte 0082 ]
41
(ASCII "A")
Byte 0083
Byte 0084 ]
42
(ASCII "B")
Byte 0085
Byte
OOFC]
7E
Byte
OOFD
Byte
OOFE]
ESC Z ***
Byte
OOFF
Byte 0100 ] ESC a ***
Byte 0101
Byte 0102 ] ESC b ***
Byte 0103
Byte 0104 ] ESC c ***
Byte 0105
Byte 0106 ] ESC d ***
ENDS Byte 0107
NOTES:
* Each
table
entry
is
stored
in memory
as
four
4-bit
hex
characters,
comprising two
8-bit
bytes
as
depicted
above.
**
Table
data
for
character
under ASCII
hex
code
20
is
accessed
by
ESC Y
over
the
interface
during
normal
print
mode.
*** Table
data
for
characters
under ASCn hex
codes
7F, 80, 81, 82 and
83
are
accessed
by ESC Z,
ESC
a, ESC b, ESC c and ESC d
respectively
over
the
interface
during
normal
print
mode.
Figure 3-5 DOWN-LOAD TABLE
MEMORY
MAP
3-16
REV
A (4/82)
3.16.2.4 Load Address
The load address consists
of
four hex
characters
(two bytes)
that
specify
the
starting
location in memory where
the
table
data
in this record is
to
be
loaded. The most
significant address
byte
(the two most significant hex
characters)
must
be
sent
first. The
diagram in Figure 3-5 defines
the
print
wheel
table
memory layout.
The block of memory addresses
allocated
for
the
print wheel
table
extends
from 0040 hex
thru
0107 hex.
If
a Load Address outside this range is specified,
it
is
interpreted
as
an
error
in
data
format
and causes
the
Model 620
to
abort
the
Down-Load mode. The
data
in
each
table
entry
occupies two
byte
locations of
storage,
and
the
data
is loaded in
ascending order
.2!.
hex value
of
the
corresponding ASCn
characters.
The load address specified in
the
record
must
be
equal
to
two
times
the
hex value of
the
first ASCn
character
whose
print
data
will be loaded in
the
table
by this record.
For
example, if this is
the
second
record
of
a multiple-record down-load and
the
first
table
entry
to be loaded by this
record
is for
the
ASCn
character
"B" (hex 42),
the
Load
Address for this
record
is 084 (hex). The two
bytes
of
table
data
associated
with printing
the
"B" will
actually
occupy locations 0084 and 0085, followed by
the
two
bytes
of
data
associated with
the
ASCn
character
"c" (hex 43) in memory
locations
0086 and 0087, and
so
on
for all subsequent
characters
in ASCn hex order. The Load Address for a single-
record down-load, and for
the
first
record
of
a multiple-record down-load, is always 0040
hex; corresponding to two
times
the
lowest hex code (20)
that
represents
a
printable
character
in
the
Model 620. Note
that
the
table
data
in
some
locations is
the
data
accessed by
ESC
codes conforming
to
ISO
standards.
3.16.2.5 Table
Data
Each print wheel
table
entry
requires two bytes
of
data
(four hex
characters).
The four
hex
characters
comprising
these
two bytes
are
recognized in
the
following order:
The
First
hex
character
represents
First
byte,
high 4
bits
Second hex
character
First
byte, low 4 bits
Third hex
character
Second
byte,
high 4
bits
Fourth hex
character
Second
byte,
low 4
bits
format
of
the
two bytes is defined below.
BIT
7 6 5 4 3 2 1 0
1st
Byte -P H H H ps ps ps ps
2nd Byte - R S S S S S S S
Where: P = 1 if this is a printable position on this
print
wheel;
0*
if
this is a nonprinting position
H =
hammer
energy 1
to
4
(0
= no
hammer
fire)
ps = proportional space value 0
to
15
R = 0
at
all
times
(no ribbon
lift
action
required)
S = absolute
electrical
spoke position 0
thru
99 (Spokes 1
to
100).
(Electrical
spoke positions
greater
than
99 will
select
spoke 0
and inhibit hammer fire.)
* = CAUTION: Failure
to
assign nonprinting
status
(P=O) when needed may
result
in
print
wheel damage by allowing
the
hammer
to
fire
against
the
print
wheel
flag.
REV
A (4/82) 3-17
Diablo publishes a
Print
Wheel
Data
Book (Publication
No.
90445-XX) which contains
the
print wheel
data
that
must be
inserted
by
the
host system when assembling a down-load
print
wheel table.
All of
the
100 locations in
the
table
must be loaded. For any nonprinting print wheel
positions,
the
IIplI
bit
shown in
the
table
data
format
(the highest
bit
in
the
first
byte)
must be a
110
11
. The
states
of
all
other
bits associated with
that
position
are
then
irrelevant
except
for
the
IIpSIl
bits (low 4 bits of
the
first
byte).
If
this nonprinting
position should ever
be
addressed in normal printing mode,
the
Model 620 will
default
to
a
space mode in which
the
value specified by
the
IIpSIl
bits for this
character
determines
the
amount
of
carriage
movement
that
occurs.
Any down-loaded
table
that
will be used in a telecommunications environment must
conform
to
the
internationally
accepted
ASCn/ISO conventions regarding
the
specific hex
code assigned to each ASCn
character
(see Figure 4-1).
3.16.2.6 Checksum
The checksum consists
of
one
data
byte (two hex
characters)
produced by
the
host system.
It
is
the
negation (i.e.
the
112'sll
complement)
of
the
modulo
256
sum of all
data
bytes,
starting
with
the
byte
count.
When
all
of
the
data
bytes
'starting
with
the
byte
count
are
added
together
as received by
the
unit, and
the
checksum is
then
added,
the
result should
be zero.
No
end-around
carry
is used when
the
check is calculated.
If
the
check calculation results in a nonzero sum,
it
is
detected
as
an
error
in
data
format,
a
NAK
is
transmitted
by
the
Model 620, and
the
down-load mode is aborted. In
this situation,
print
wheel selection defaults
to
the
embedded tables.
3.16.3 Down-Load Procedure
Described below is
the
general sequence
of
events
that
comprises a proper down-load
procedure. The diagrams in Figure 3-3 will aid
the
reader
in understanding
the
procedure
described here.
1. At power-up,
remote
reset
(ESC
CR
P), or initialize (ESC
SUB
1),
the
down-load
table
memory locations
are
initialized to
all
zeros, and one
of
the
resident
default
print wheel
tables
is
used,
as
selected
by information encoded on
the
print wheel
installed.
2.
The host sends
the
sequence
ESC
SO
DC2
to
put
the
Model 620 into
the
down-load
mode.
3.
The host sends
the
properly
formatted
record(s) containing
the
table
data.
If
this is
being done
as
a single-record down-load,
the
entire
table
will be loaded by one
record. If
it
is
being done
as
a multiple-record down-load, subsequent records must
be
sent
to
load
the
remaining portions
of
the
table
data.
After
each
correctly-received
record,
the
Model
620
sends an
ACK
character
back
to
the
host, and
then
awaits
the
liS"
character
at
the
start
of
the
next
record, or
the
DC4
character
that
terminates
the
down-load mode. Any
other
characters
received during this waiting period
are
simply ignored by
the
Model
620.
Any
error
in
data
format
detected
while a
record
is being received, or
as
a
result
of
the
checksum calculation, will cause
the
Model 620
to
transmit a
NAK
character
and immediately
abort
the
down-load mode.
3-18
REV
A (4/82)
'.
4.
After
the
ACK
from
the
last
record has been received,
the
host sends a DC4
character
to
take
the
Model
620
out
of
the
down-load mode. The Model
620
will
now
use
the
down-loaded print wheel
data
for all ASCII-to-spoke translation
3.16.4 Sample Down-Load
Structure
,..----RECORD
START
RECORD TYPE
[0
BYTE COUNT
I,
[ [ LOAD ADDRESS
CHECKSUM~
,TABLE
DATA
~r----l'---'r----lr----lr----lr----lr----l'---'r----l'--''----''---''----''----'rl.
S1230040B585A3A5A4A1C6nCC587C8CFC7cn9297A3CCA3CAB58FA58B93CE94A39300A49F05
S1230060C5n6A502B503B504B505B507B5n8B509C5nAB50BA390A39BC6n1A589C6C9A591F1
S1230080C8CBC792C688B7A4C7AOC690C696C7A8C79AB399B595C7AEB694C8A6C798C79E57
SllEOOAOC68AC7B4C79CC58EB693C7A2C68CC8AAC7B2C7ACB686058005800513
S12300BB800580958093A9B5BBB5C4B5BEB5BCB5BAB4AOC5C1B5BOA3AFB3B1B5C5A3ABC8E3
S123000BBOB5B9B5B8C5C3C5C8A4B7B4B3B4B5B5BFB5COB7B6B5C6B5C2B5C793A7058005AE
Sl0800FB800580058072
FIRST RECORO:
S = Record
Start
1 = Record
Type
23 =
Byte
Count
=
2316
=
3510
0040
= Load Address (Hex)
TABLE
DATA:
(First
two
entries)
r---
=
PRINTABLE
CHARACTER
1011
~
=
HAMMER
ENERGY
(3)
0101-=
PS
UNITS
(5)
r---
=
RIBBON
UP
1000
~
=
SPOKE
POSITION
(5)
0101
r---
=
PRINTABLE
CHARACTER
1010
~
=
HAMMER
ENERGY
(2)
0011-=
PS
UNITS
(3)
r---
=
RIBBON
UP
1010
~
=
SPOKE
POSITION
(37)
0101
05=
CHECKSUM
Figure 3-6 SAMPLE DOWN-LOAD STRUCTURE
Figure 3-6 shows a printout
of
the
group
of
records comprising an
actual
print
wheel
down-load
structure.
Following
the
printout,
each
element
of
the
first
record
is
separated
and defined.
As
stated
earlier,
this printout
serves
only
as
a hard-copy
reference
of
the
assembled down-load
elements
-
it
does not actually
occur
as
part
of
the
down-load
process.
In
the
example shown, seven
separate
records
are
used
to
down-load
the
table
data
for a
particular
print wheel. The number and length
of
the
records in this example have no
general significance;
it
is simply
the
way
the
down-load was
structured
by this
particular
host system.
REV
A (4/82) 3-19
3.17 SELF TEST/REMOTE DIAGNOSTIC FEATURES
The Model 620 provides
several
features
to enable
the
operator
and
service
personnel
to
analyze
apparent
malfunctions quickly and
accurately.
The two major
features
are:
1.
Internal
Self
Test
2.
Remote
Diagnostics
620-SPI
..•..
selftest
•.•..
!
romok
ramok
T
¢!"#$%&'()*+,-./0123456789::<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[~]~
~
!"#$%&'()*+,-./0123456789::<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[~]~
~a
~
"#$%&'()*+,-./0123456789::<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[~]~
~ab
~
#$%&'()*+,-./0123456789::<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[~]~
~abc
~
$%&'()*+,-./0123456789::<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[~]~
~abcd
~
%&'
()*+,-./0123456789::<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[~]~_~abcde
t r 132 columns
~
Figure 3-7 SAMPLE SELF TEST PRINTOUT
3.17.1 Self
Test
Feature
The Model 620 Self
Test
feature
provides an
automatic
indication of proper operation. The
self
test
is invoked by
selecting
the
self
test
function on
the
switch block
to
the
left
of
the
Operator
Control Panel under
the
top access cover. When this
feature
is
selected,
the
Model 620 will
automatically
execute
the
Self
Test
routine,
testing
ROM, RAM, and
the
printing capability. The
elements
of
the
Self
Test
are
shown in Figure 3-7 and explained
below.
Self
Test
may be
interrupted
and
restarted
using
the
Control
Panel
PAUSE and
RESET switches, and will continue until power is
turned
off.
1. Sign-On
The
first
part
of
the
test
prints
the
sign on message: "Model 620-SPI
.•
Self Test"
indicating basic
printer
function.
2.
ROM
Test
A CRC-16 algorithm is used
to
ensure
correct
ROM
data.
The
calculation
is a
bit
serial
polynomial division
starting
with
the
most significant
bit
of
the
last
byte.
Completed
data
is used
to
enable blank
ROM
locations
to
be ignored. The
result
is
zero
if
the
ROM
is coded
correctly.
Status
of
the
ROM
condition is printed -
either
"romok" or "rombad". A ROMBAD condition prevents
execution
of
the
Swirl
Test.
3.
RAM
Test
RAM
is
tested
non-destructively. Each individual
bit
is
set
and
cleared
to
ensure
the
rear/write
capability.
Status
of
the
RAM
condition is
printed
-
either
"ram ok"
or "rambad". A
RAMBAD
condition ends
the
Self
Test.
3-20
REV
A (4/82)
n
4.
Swirl
Test
The Model 620 begins to
print
out
98 lines
of
an
incremented
pattern
of
the
full
Ascn
character
set
on
the
print
wheel,
called
Swirl Text. This gives a visable
indication
of
printing capability.
3.17.2
Remote
Diagnostic
Feature
The Model 620
Remote
diagnostic
feature
allows execution of
certain
diagnostic routines
remotely
from a host system. Diagnostic routines
are
activated
using a
three
character
ESC
sequence. The diagnostic function commands
are
as follows:
Seguence Result
ESC
SUB
I
ESC
SUB
R
ESC
SUB
1
ESC
SUB
SO
ESC
SUB
ENQ
Remote
Initialize
Remote
Error
Reset
Status
1 Request
Ram/Rom
Test
Enter
Test
Mode
3.17.2.1
ESC
SUB
I -
Remote
Initialize
This command will
cause
the
Model 620
to
unconditionally
execute
an
initialize
sequence
regardless
of
any
error
conditions
that
may exist within
the
printer.
Unlike
the
corresponding sequence
ESC
CR P, this command is
executed
immediately
when
received
over
the
interface.
The Model 620 will
default
to
the
same
conditions specified by ESC
CR
P. This command should be
preceded
by a non-printing
character
to
cause
the
Model
620 to
abort
any multiple
character
sequence in progress. Once this command has
been
sent
sufficient
time
must
be
allowed for all
reset
motion
to
cease
before
sending any more
commands.
3.17.2.2
ESC
SUB
R -
Remote
Error
Reset
This command causes
the
Model 620
to
reset
any
error
conditions.
If
the
printer
is in
check
it
will
execute
a
restore.
Due
to
internal
program
latency,
the
minimum
time
necessary
to
reset
all
errors
is 250 msec. This command is essentially
the
same
as
pressing
the
RESET switch on
the
control
panel.
3.17.2.3
ESC
SUB
1 -
Status
1 Request
This command causes
the
Model 620
to
transmit
Status
Word
lover
the
interface.
The
bit
definitions for this word
are
as follows:
o -
1 -
2 -
3 -
4 -
5 -
6 -
7 -
3.17.2.4
unassigned =
LO
10
Pitch
= HI,
other
=
LO
unassigned =
LO
unassigned =
LO
unassigned =
LO
Printer
Idle =
HI
(print
buffer
empty
and
all
printer
motion complete)
unassigned =
LO
UART
Parity
bit
(not
detected
in
remote
diagnostics)
ESC
SUB
SO
-RAM/ROM
Test
This command causes
the
Model 620
to
execute
a
self
test
sequence. The
test
executed
consists
of
the
RAM
test
and
the
ROM
CRC
test
portions only
of
the
basic
self
test
REV
A (4/82) 3-21
routine.
No
indication of
test
pass or fail is printed out.
At
the
end of
the
test
a
status
byte
is
transmitted
to
the
host system. Note
that
this command should
not
be
sent
while
the
Model 620 is busy. The
bit
definitions
are
as follows:
3.17.2.5
o -
1 -
2 -
3 -
4 -
5 -
6 -
7 -
8041
RAM
Bad =
HI
8041
ROM
Bad =
HI
6803
RAM
Bad =
HI
6803
ROM
Bad, upper
half
4K
=
HI
6803
ROM
Bad, lower
half
4K
=
HI
unassigned =
LO
unassigned =
LO
UART
Parity
bit
(not
detected
in
remote
diagnostics)
ESC
SUB
ENQ
-
Enter
Test
Mode
This command causes
the
Model
620
to
enter
test
mode. Upon
receipt
of
this command
the
printing motion will stop when individual
data
bytes
clear
the
print
buffer.
An
SO
character
is then
sent
indicating
start
of
test
mode, where individual
data
bytes define
the
following:
@,
data
byte
A
B
C
D
DEL
6803
RAM
data
will
be
read
after
receipt
of
the
second byte. This
second
byte
defines
the
data
address within
the
RAM, according
to
its
ASCn code. The Model
620
then
transmits
two
data
bytes:
1)
STX; and
2)
data
byte
representing
the
contents
of
the
RAM
location
addressed (location 2216 contains
the
information
read
from
the
print
wheel itself. See
the
table
below.)
Perform RAM/ROM
check
exactly
as
above with
the
sequence
ESC
SUB
SO.
Print
1 line of swirl
text,
132
characters.
An
ACK
character
will
be
transmitted
following
the
printing
of
the
132nd
character.
Print
swirl
text
continuously.
Stop printing swirl
text
immediatly. Printing is stopped and
the
line
will be
terminated
with CR and LF. An ACK
character
will
be
transmi
tted.
Exit
test
mode,
re-initialize
printer
with
same
effect
as
power-on
reset. (allow
sufficient
time
for all
restore
motion
to
cease)
Data
Byte 22(HEX) -Bit Significance
0 1 2 3 4 5 6 7
0 0 0 = (not used) 0 = Rib Adv =
Car
Adv 0 0 0 0 = U.S./U.K. English
0 0 1 =
P.S.
1 = Rib Adv =
Car
Adv 0 0 0 1 = Ger.,Swiss,French
0 1 0 = (not used)
+1
Car
step
0 0 1 0 = Swedish-Finnish
0 1 1 = (not used) 0 0 1 1 = French-Italian
1 0 0 =
15-Pitch
0 1 0 0 = Dutch
1 0 1 =
12-Pitch
0 1 0 1 = Norwegian-Danish
1 1 0 = (not used) 0 1 1 0 = Spanish
1 1 1 =
10-Pitch
0 1 1 1 = Portuguese
1 0 0 0 = South African
1 0 0 1 = Multi-National
1 0 1 0 = French Canadian
3-22
REV
A (4/82)
"
o
..
SECTION 4
OPERATING REFERENCES
4.1 GENERAL INFORMATION
This
Section
contains
the
charts
and
tables
which
support
Section
3 OPERATING
CONSIDERATIONS.
Note
that
these
charts
and
tables
are
general
in
nature
and
do
not
necessarily
reflect
the
character
set
on
the
print
wheel
in use.
Cross
reference
information
is
to
be
found in
the
Diablo
Print
Wheel
Data
Book,
Publication
No. 90044-XX.
4.2 ASCII CODING SYSTEM
The
Ascn
Coding
System
is
based
on
the
Americal
National
Standard
Code
for
Information
Interchange,
Standard
No. X3.4-1977
of
the
Americal
National
Standards
Institute,
Inc.
b,
.....
0 0 0 0 1 1 1 1
Bits
b6~
0 0 1 1 0 0 1 1
b5~
0 1 0 1 0 1 0 1
~4
b3 ba bl I
..
0 1 2 3 4 5 6 7
......
.~Jto~.
0000
0
NUL
OLE
SP
0 ® P ,
::::::::::
(~)
0001
U
SOH
DCI
D I A Q
i?~I
;;;;}::
.
0010
2
STX
DC2
II
2 B R
{;J;;;:
!t
001
1 3
ETX
DC3
# 3 C S
0100
4
EOT
DC4
$ 4 0 T ?
o
101
5
ENQ
NAK
0/0
5 E U
o 1 1 0 6
ACK
SYN
& 6 f V
o 1 1 1 7
BEL
ETB
, 7 G W
:;;)~;~~
:;:;:
1000
8
as
CAN
( 8 H X
;:;:;:
100
1 9
HT
EM
) 9 I Y
1 0 1 0
10(A)
LF
SUB
* • J Z
·
1 0 1 1
11
(8)
VT
ESC
+ · K [
~:;:;
{
,
1
100
12(c)
FF
FS
< L \ •
, •
1 1 0 1
13(D)
CR
GS
-= M l
;::::;;:
}
1 1 1 0
14(E)
So
RS
> N
,...
'"""'"
•
:::
111
1
lS(F)
SI
US
/ , 0
DEL
• -
Figure
4-1 STANDARD ASCII CODE
CHART
REV A
(4/82)
4-1
4.3 PRINT WHEEL CODE
CHART
(Typical)
Model 620
firmware
features
embedded
print
wheel
look-up
tables
for
the
98-character
print
wheels
currently
available.
New
print
wheel
releases
and/or
custom
designs
of
up
to
100
printable
characters
can
be
accommodated
using
the
down-load
feature.
The
chart
in
Figure
4-2 provides a
general
sample
of
data
for
the
U.S.
English
print
wheel
supported
by
Model 620
firmware.
Note
that
the
print
character
codes
HEX 20, 7F, 80, 81, 82 and 83
are
non-printing
in Model 620. The
print
characters
depicted
for
these
codes
may
be
addressed
using
the
sequences
ESC Y, ESC Z, ESC
a,
ESC b, ESC c
and
ESC d
respectively
to
provide a
complete
set
of
100
codes
for
print
wheel
addressing
in
the
down-load mode.
Sl20ke HEX
Char.
Sl20ke HEX
Char.
Sl20ke HEX
Char.
ESC c undef.*
2i3
~
1 34 + 67 M
2 ESC d undef. *
35
55
U
68
22
"
3 5F
36
3D =
69
58
X
4 7A -
37
43 C
70
28
(
z
5 71 q
38
2D 71 5A Z
6 6A j
39
47
G
72
31 1
7
78
x
40
53 S
73
26
&
8
6B
k
41
52
R 74
39
9
9
76
v
42
2F /
75
38 8
10
62
b
43
4F 0
76
37
7
.11
70
p 44 3A
77
36 6
12 6C 1 45
48
H
78
35
5
13 6D m 46
24
$
79
30 0
14
66
f 47 54 T 80 34 4
15
64
d 48
25
% 81
33
3
16
69
i 49 4A J
82
32
2
17 6E n 50
45
E 83
7B
±
18
61
a
51 56
V 84
40
@
19
65
e
52
41 A 85 7D 2
20
74 t
53 50
P
86
60
~
21
68
h 54
27
87 ESC Z 3
22
6F 0
55
4E N 88 5E 1
~
23
72 r
56
49 I 89
5B
[
24
73
s
57
44 D
90
3E >
25
67
g
58
3F ?
91
5C l
26
63
c
59
46 F
92
3C <
27
75
u
60
2A
*
93
23
#
28
79
Y
61
4B
K 94 5D ]
29
77
w
62
21
95
ESC a ®
30 2E
63
51
Q
96
7E 0
31
57
W 64 4C L
97
ESC Y ¢
32 2C ,
65
42
B 98 7C §
33
59
Y
66
29
)
99
ESC b
II
100
3B
* =
Flag
positions on
98-Character
print
wheel
Figure
4-2 100-CHARACTER PRINT WHEEL -COMPOSITE
4-2 REV A (4/82)
0
o
.,
4.4
DECIMAL
VALUE
TABLES
TABLE
4-1
ASCn
VALUES
FOR
ESC
SEQUENCES
HMI/VMI
ASCII
Character
Set
HMI
and VMI
CTRLA
ASCII
0 (SOH)
HMI/VMI
ASCII
Character
HMI/VMI
Character
CTRL
B
CTRL
[
1 (STX)
26
ESC
51
4
CTRL
C
CTRL
\
2 (ETX) 27 (FS) 52 5
CTRL
D
CTRLJ
3
(EaT)
*28
(GS) 53 6
CTRL
E
CTRL
A
4 (ENQ)
**29
(RS) 54 7
CTRL
F
CTRL
-
5 (ACK)
30
(US) 55 8
CTRLG
6 (BEL)
31
SPACE
56
9
CTRL
H
7 BACKSPACE
32
! 57
CTRL
I
8 TAB 33 " 58 ,
CTRL
J
9 LINEFEED
34
# 59 <
CTRL
K
10 (VT) 35 $ 60 =
CTRL
L
11
(FF)
36
%
61
>
CTRLM
12 RETURN 37 &
62
?
CTRL
N
13
(SO) 38 , 63 @
CTRLO
14 (SI)
39
(
64
A
CTRL
P
15 (DLE)
40
) 65 B
CTRL
Q
16
(DCl)
41
*
66
C
CTRL
R
17 (DC2)
42
+
67
D
CTRL
S
18 (DC3) 43 , 68 E
CTRLT
19 (DC4)
44
-69 F
CTRL
U
20
(NAK)
45
70 G
CTRLV
21
(SYN)
46
/
71
H
CTRLW
22
(ETB)
47
0 72 I
CTRLX
23 (CAN)
48
I 73 J
CTRLY
24
(EM)
49
2
74
K
CTRLZ
25 (SUB) 50 3 75 L
*Diablo
Typewriter
Paired
keyboard
uses'
(accent
grave)
**Diablo
Typewriter
Paired
keyboard
uses =
(equals
symbol)
REV A (4/82) 4-3
HMI/VMI
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
ASCII
ASCII
Char.cter
HMI/VMI
Character
M 101 f
N 102 g
a 103 h
P 104 i
Q 105 j
R 106 k
S 107 1
T 108 m
U 109 n
V 110 0
W
III
p
X
Jl2
q
Y 113 r
Z
114
s
[ 115 t
\
116
u
] 117 v
1\
118 w
119 x
-
\ 120 y
a 121 z
b 122 {
123 I
c I
d
124
}
e 125
.....
TABLE 4-2
ASCn
VALUES
FOR
ESC SEQUENCES
Set
Absolute
Tab
(H & V) and.
Lines/Page
Lines
or
Lines
or
Lines
or
ASCII
Lines
or
ASCII
Lines
or
ASCII
Po
·t·on
ASCII
Char
cler
51 I a
P"t"
ASCII
Ch
OSI
Jon
arac er P
·t·
Ch
t P
·t·
Ch
t
P"t"
Ch
t
OSI
Ion
arac
er
OSI
Jon arac
er
as]
Jon arac
er
CTRL A
CTRL
Z
1 (SOH)
26
(SUB)
51
3 76 L
101
e
CTRL B
CTRL
[
2 (STX) 27 ESC 52 4 77 M 102 f
CTRL C CTRL \
3 (ETX) 28 (FS) 53 5 78 N 103 g
CTRL D
CTRL]
4
(EaT)
*29 (GS) 54 6 79 a 104 h
CTRL E
CTRL
,..
5 (ENQ)
**30
(RS) 55 7
80
P 105 i
CTRL F
CTRL
-
6 (ACK)
31
(US) 56 8
81
Q 106 j
CTRL G
7 (BEL)
32
SPACE 57 9 82 R 107 k
CTRL H
8 BACKSPACE 33 ! 58 83 S 108 I
CTRL I
9 TAB
34
" 59 ,
84
T 109 m
CTRL J
10 LINEFEED 35 # 60 < 85 U 110 n
CTRL K
II
(VT)
36
$
61
=
86
V I
11
0
CTRL L
12
(FF)
37 % 62 > 87 W 112 p
CTRL M
13
RETURN
38
& 63 ? 88 X 113 q
CTRL N
14 (SO)
39
64 @
89
Y 114 r
CTRL a
15
(SI)
40
( 65 A
90
Z 115 s
CTRL P
16 (DLE)
41
) -66 B
91
[ 116 t
CTRL Q
17
(DCI)
42 * 67 C 92 \ 117 u
CTRL R
18 (DC2) 43 + 68 D 93 ] 118 v
CTRL S
19 (DC3)
44
69 E
94
A 119 w
,
CTRL
T·
20
(DC4) 45 -70 F 95 120 x
-
CTRL U
21
(NAK)
46
71
G 96 \ 121 y
CTRL V
22
(SYN)
47
/ 72 H 97 a 122 z
CTRL W
23 (ETB) 48 0 73 I 98 b 123 {
CTRL X
24 (CAN) 49 I 74 J 99 c 124 I
I
CTRL Y
25 (EM) 50 2 75 K 100 d 125 }
*Diablo
Typewriter
Paired
keyboard
uses •
(accent
grave) 126 -
**Diablo
Typewriter
Paired
keyboard
uses = (equals
symbol)
4-4 REV A (4/82)
Q
XEROX
XEROX~
and
Diablo
are
trademarks
of
XEROX
CORPORATION
Diablo Systems Incorporated
24500
Industrial
Boulevard
P.O.
Box 5003
Hayward.
California
94545
A Xerox
Company
Printed
in
U.S.A.

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